Scoble writes something - 6,800 writes are kicked off, 1 for each follower. Michael Arrington replies - another 6,600 writes. Jason Calacanis jumps in - another 6,500 writes. Beyond the 19,900 writes, there's a lot of additional overhead too. You have to hit a DB to figure out who the 19,900 followers are. [...] And here's the kicker: that giant processing and delivery effort - possibly a combined 100K disk IOs - was caused by 3 users, each just sending one, tiny, 140 char message. How innocent it all seemed.
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